Telephone-transmitter.



I. Z. MILLER.

' TELEPHONETRANSMITTER.

APPLICATION FILED APR. 18. I9l7.

152, Patented May14,1918.

I .IIIIIIIIIIIIZI UNITED STATES AE fl'rmnrnonn-mansmrrmpe ification orLe ter-s P n PatentedsMay. 14,1918.-

-App green-0n. filed-April 18, :1917. -"-'Scr ia1;No-. 4162, 850.

" To et'll wk'om c't-mag concern 1 Be it k 1roWnthat} I,. 'J'0HN MILL R, l a citizen of the iU-nited s tates, residing at *Erie, in the--coiinty of '--Erie and .State of Pennsylvania; have invented new -and}; useful Improvements, in Telephone Transmit 'ters, --ofwhich -*=the following is 5a I specification.

"This invention-relates to telephone trans mitters and consists in certain improve ments in the construction thereof as will be hereinafter fully described and pointed out in the claims.

The invention is illustrated in the accom panying drawings as follows Figure 1 shows a central section through the transmitter on the line 11 in Fig. 2.

Fig. 2 a section on the line 2-2 in Fig. 1.

Fig. 3 an enlarged portion of one of the diaphragm rings with one of the terminals.

Fig. 4 an enlarged view showing the spring between the diaphragm rings.

1 marks the case. This has the screwthreaded opening 2 into which the mouth piece 3 is secured. A back plate 4 is secured to the case by screws 5. The diaphragm 6 has the plating 7 arranged at its center. An electrode 8 has the screw-thread ed projection 9 which extends through an opening 10 in the back plate 4 and is provided with the nuts 11 both for securing the electrode in place and for securing one of the telephone wires. A granulated conducting material 12 is arranged between the diaphragm and the electrode 8 being retained in place by a felt washer 13 which forms a pocket in which the granular material is placed. The opposite terminal of the telephone 14 extends from the post 15 through the insulating plug 16 in the back plate 1 and into the diaphragm ring 17. The diaphragm ring has the same diameter as the diaphragm. The diaphragm is mounted on this ring.

Springs 18 are arranged between the diaphragm and ring 17. By means of these springs the edges of the diaphragm, ring and parts are yieldingly pressed into engagement between the case and back plate but the diaphragm is not clamped, consequently is free to vibrate.

It is desirable to exclude the air from the space inclosed by the diaphragm ring. To accomplish this I provide the rubber band 19. This band is stretched around the diaphragm ring and over the edge of the diabe used and when made of proper: size. the

-'e'dge ofithe' band will pass :ozver theedge of the diaphragmand-alsounder the ring 17,

cluding the air from entering at this point. In assembling the parts-the-terminal 14 "extends slightly through the back plate and is forced through the rubber ring into the diaphragm ring. The rubber ring forms a complete insulation at this point and also forms a seal around the wire 14.

In order to more eflectually seal the openings through the back plate I provide the celluloid washer or disk 20. This is clamped to the back plate by means of the electrode 8,

The usual shell case is provided which forms a support or connection for the support for the transmitter.

What I claim as new is 1. In a telephone transmitter, the combination of a diaphragm ring; a diaphragm mounted on the ring; and a flexible band extending around the ring and over the edge of the diaphragm sealing the space between the diaphragm and ring.

2. In a telephone transmitter, the combination of a diaphragm ring; a plate on which the diaphragm ring is mounted; a diaphragm mounted on the ring; and a flexible band extending around the ring and over the edge of the diaphragm and between the ring and the plate, sealing the space between the diaphragm and ring and between the ring and the plate.

3. In a telephone transmitter, the combination of a diaphragm ring; a diaphragm mounted on the ring; and a rubber band extending around the ring and over the edge of the diaphragm sealing the space between the diaphragm and ring.

4. In a telephone transmitter, the combination of a diaphragm; a ring on which the diaphragm is mounted; means for holding the diaphragm and ring together comprising a case and back plate; springs between the diaphragm and ring; and a band surrounding the ring and extending over the edge of the diaphragm sealing the space between the ring and diaphragm.

5. In a telephone transmitter, the combi- :lphragm. ordinaryi flat'rubber bandmay which the ring is mounted; a terminal Wire extending through the back plate and into the ring; and a rubber band surrounding the ring extending over the edge of the dia phragm and between the ring and the plate through which the wire extends, said rubber band forming a seal around the wire and sealing the space between the diaphragm and ring.

6. In a telephone transmitter, the combination of a ring; a diaphragm mounted on the ring; a plate on which the ring is mounted; an j electrode mounted on the plate; a granular material between the electrode and the diaphragm; a felt washer surrounding the granular material; and an insulating disk arranged on the plate and extending between the ring and the plate and between the electrode and the plate.

7 In a telephone transmitter, the combination of a ring; a. diaphragm mounted on the ring; a plate on which the ring is mounted; an electrode mounted on --the plate; a granular'material between the elec trode and the diaphragm; a felt washer surrounding the granular material; and an insulating disk arranged on'the plate and extending between the ring and theplate and between the electrode and the plate, said disk being clamped in place by the elec- :1

trode. V .i

In testimony whereof I have hereunto set my hand. 1

- JOHN Z. MILLER.

cum of thllpltent may be obtained for five cents each, by addressing the Commissioner of ratea ts. Washington, D. 0." 

